Grinding-machine



PATBNTEI] FEB. 16, 1904.

R. WOLF; v GRINDING MACHINE. APP LIGATIO'N FILED NOV. 13, 1903 HQKODEL.

INVENTOR.

'- wac WITNESSES.

- UNITED STATES Patented February '16, 1904.

PATENT OFFICE.

GRINDING- MACHINE.

, SPEGIFIGATION'forming part of Letters Patent No. 752,500, dated February 16, 1904.

Application filed November 13, 1903. Serial No. 181,018. (Nb model.)

To all whom it may concern;-

Be itknown that I, Runorrn Wonna citizen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have 5 invented a new and useful Grinding-Machine, i

{ ordinarily made of maple wood, although the of which thefollowing is a specification;

My invention relates to grinding-machines more especially adapted for grinding knife-f blades, and has for its object to produce a machine of this character which shall be inex pensiveto make, easy to operate, and rapid in; operation, and which will grind the blades; either fiat or rounded, so calledthat is, slightlyconvexor if a relatively small stone is used will grind the blades concave.

With the above ends in view I have devised 2 the novel grinding-machine which I will now describe, referring to the accompanying dr'aw- 1 ings, forming a part of this specification, and using reference characters to indicate the sev-; eral parts. v

Figure 1 is a plan view of my novel machinei complete, showing the position of the parts at the instant of finishing the grinding of a blade;; Fig. 2, a section on the line 2 2' in Fig. 1;; and Fig. 3 is an enlarged elevation of the,

blade-carrying block detached, showing a;

blade in position thereon.

10 denotes framework of any. ordinary or preferred construction, and 11 a table sliding in ways 13 in the framework. Upon the under side of the table is a rack 14, which is engaged by a pinion 15 on a transverse shaft 16,

shown as journaled in hangers under the table. At one end of the shaft is a crank 17, connected by means of a rod 18 to a foot-lever 19. At theopposite end of the crank is an arm 20, which carries an adjustable counter- 22 indicates a grinding-wheel. The action of the counterweight is to oscillate the shaft and by means of the rack and pinion move the table forward and retain it in operative position, as will be'more fully explained. To move the table backward away from the grinding-wheel in order to remove a ground blade and place another in position to be operated upon, the operator simply presses down upon grinding.

the footlever. Any other convenient means for moving the table backward may of cours be substituted, if preferred. 23 indicates a blade, which is shown as carried by a block 24. This block in practice is material of which the block is made is unimportant so faras the principle of the invention is concerned. This block rests in a U- shaped holder- 25, which is pivoted to oscillate in the vertical plane in an opening 26 in a carrier 27, which itself oscillates in the horizontal plane, being pivoted on a central stud 28,

which engages the table. The U-shaped holder 5- is shown as swinging on screw-studs 29,which engage the carrier, and as provided with a hand-piece 30 for convenience in operation. The block is shown as adjustably secured to the holder by means of bolts 31, which pass through slots 32 in the block.

33 denotes an arm rigidly secured to the carrier and extending forward over the rear end of the block and provided at its forward end with a set-screw 3 1, engaging the block, which determines the adjustment of the surface. to be operated upon relative to the grinding-surface and retains the block and the blade carried thereby in position for flat 35 denotes venient manner, as by coil-springs 39, the inner ends of which are connected to the carrier andthe outer ends to opposite sides of the table,

- as at an.

In use the operator places the machine and the grinding-wheel in such a position relative hand-levers pivoted on opposite sides of the table, as at 36, whose forward ends to each other that one side only of the face of the wheel will be operative and while the machine and the wheel are in this position grinds one side of any required number of blades,

after which either the machine or the grindingwheel is shifted so that the other side of the face of the wheel will be inoperative position. 1

Then the opposite side of the blades is ground. In Fig. 1 the carrier is shown in its normal position, as when the grinding of a blade has been finished. With the parts in this position the operator would, by means of the foot- 7 lever, move the carrier backward, remove the blade therefrom, and place another blade in position to be operated upon. As soon as the pressure upon the foot-lever is relieved thel counterweight 21 will return the carrier to its normal position and place the blade in con-f The operator,

sition that the heel of the cutting edge will come in contact with the grinding-wheel, it being of course understood that the counterweight will retain the blade in contact with the wheel no matter what may be the position of the carrier. During the grinding operation the operator, by means of either or both of the hand-levers 35, oscillates the carrier and causes the blade thereon to pass longitudinally over the face of the wheel, the grinding of each blade being finished at the tip, as indicated in Fig. 1. with a grinding-wheel of what may be termed ordinary size produces what is termed a flat grind. To produce a concave grind by the same operation, it is simply required to use a smaller grinding-wheel. The position in which the side of the blade?. e., the surface to be groundis presented to the grinding-wheel isdetermined by the adjustment of the set-screw in arm 33. By turning this set- Screw inward the rear end of the block Will be depressed and the front end correspond ingly raised, thereby raising the blade rela tive to the grinding-wheel and changingthe line of action of the grinding-wheel thereon- When it is desired to impart a slightly convex form to the blades that is, produce whatis called a rounded grindset-screw 34 is; turned outward far enough so that it will not; be engaged by the rear end of the block and, the block, with the blade thereon, is oscillated? in the vertical planez'. 0., swung upwardand downward at the same time that it is being passed longitudinally across the face of the grinding-Wheel by movement of the carrier;

handpiece 30 being provided for convenience in oscillating the block. This handpiece may be used upon either side, as convenient, or may be removed from the machine when it .is not. desired to round the blades.

This operation Having thus described my invention, I claim- 1. In a grinding-machinethe combination with a blade-carrying block and an oscillatory carrier-therefor, of means for oscillating said carrier in the horizontal plane.

2. In a grinding-machine the combination with a blade-carrying block and a carrier therefor pivoted to swing in the horizontal -plane',of means as a hand-lever bearing against the carrier whereby a blade may be passed from. end to end over. the face of a grindingwheel, and springs for returning the carrier to-its' normal position when'the action of the lever is relieved.

3. In a grinding-machine the combination with a reciprocating-table provided with a rack, a pinion and connections for moving the table backward anda counterweightacting to retain the table in operative position, of a carrier pivoted to the table and adapted to oscillate in the horizontal plane and a knife-carrying block adjustably secured to the carrier.

4:. In a grinding-machine the combination with a reciprocating table provided with a rack, a pinion engaging the rack, a shaft by which the pinion is carried and which is provided with a crankand an arm, crank connections by which the table 'is moved backward and a counterweight on the arm for retaining the table in operative position, of an oscillating carrier pivoted to the table and a knife-carrying block adjustably secured to the carrier. 1

5. In a grinding-machine the combination with a knife-carrying block and a U-shaped holder to which the block is adjustably secured, of a carrier pivoted to oscillate in the horizontal plane, and having an opening in which the holder is pivoted to oscillate in the vertical plane, anda set-screw for determining the position in which the surface to be ground is presented. 1

6. In a grinding-machine the combination with a reciprocating table and ahorizontallyoscillating carrier pivoted thereto and provided with an opening, of a vertically-oscillatory U-shaped holder pivoted in said open- :ing, a slotted blade-carrying block and bolts engaging the-holder whereby the blockis adjustably secured thereto.

7. In a grindingmachine the combination with ahorizontally-oscillating carrier :and a vertically oscillating blade carrying block pivoted'thereto, of means as aset-screW for adjusting the plane ofthe block so as to vary the position of a bladeon the block relative to a grinding-machine.

8. In a grinding-machine the combination with a blade-carrying block-and aholder therefor, of a horizontally-oscillating carrier to which the holder is-pivoted to oscillate in the vertical plane, and a, set-screw engaging the block whereby the position of a blade carried thereby relative to a grinding-Wheel may be holder Will oscillate the blade in the plane of 10 regulated. rotation of the Wheel and produce a round- 9. In a grinding-machine the combination ing grind. v

with a blade-carrying block and aholder there- In testimony whereof I afiix my signature in for, of a horizontally-oscillating carrier to presence of two witnesses. 1

which the holder is pivoted to oscillate in the RUDOLPH WOLF.

vertical plane so that oscillation of the carrier Witnesses:

will move the blade longitudinally across the A. M. WOOSTER,

face of a grinding-wheel and oscillation of the S. V. ATHERTON. 

